Bosch AL9405X Alternator

Bosch Remanufactured Alternator AL9405X

Bosch AL9405X is a remanufactured 12-volt alternator built for charging-system performance and dependable electrical output. It is engineered with an internal regulator, internal fan, and a clockwise rotation design for the listed BMW applications.

The Bosch Premium Alternators line focuses on rebuilt units that are designed, built, and tested for consistent operation and reliability. For BMW owners looking for an OE-style charging replacement, AL9405X provides the correct fitment details and electrical specifications for the applications shown below.

Key Features

• 12-volt remanufactured alternator for charging-system service
• 90 amp amperage rating
• Internal regulator and internal fan design
• Clockwise rotation
• 6-groove pulley with pulley included
• Aluminum case and aluminum case material
• External fan included
• External regulator included
• Plug type 335 with rear-view plug clock position at 6 o’clock
• One-wire capable: No

Detailed Description

Bosch AL9405X is a remanufactured alternator for BMW charging-system repair where the original unit has weakened output, unstable voltage, or charging warning lights. This alternator is specified for 2001-2006 BMW 325Ci, 330Ci, and 330xi; 2001-2005 BMW 325i, 325xi, and 330i; 2001-2003 BMW 525i and 530i; and 2001-2002 BMW Z3, all listed for the 90 amp alternator application. The Bosch AL9405X part number is also useful when cross-referencing OE-style replacement needs for the same application.

This part cross-references BMW 12317501592 for the same application.

What It Helps Fix

• Battery warning light caused by low alternator output
• Dim headlights or inconsistent electrical performance
• Battery drain from a charging system that no longer maintains voltage
• Accessory or electronics issues tied to unstable system voltage
• Noise or wear concerns related to a failing alternator assembly

Installation Notes and Tips

Verify the vehicle’s original alternator rating and connector style before installation. Confirm pulley groove count, rotation direction, and plug orientation against the removed unit to match the Bosch AL9405X specifications. For BMW 325Ci, 330Ci, 330xi, 325i, 325xi, 330i, 525i, 530i, and Z3 applications, compare the existing charging system components and belt routing before final fitment.

Quality Assurance

Bosch Premium Alternators are built and tested to meet charging-system performance and reliability expectations for remanufactured replacement parts. The AL9405X is packaged in a box and supplied as a remanufactured Bosch alternator for the listed BMW fitments.